Signal instrument for telephone-substations.



PATENTED MAY 9, 1905.

H. M. CRANE. SIGNAL INSTRUMENT FOR TELEPHONE SUBSTATIONS.

APPLICATION FILED JAN. 2, 1904.

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NITED STATES Patented May 9, 1905.

PATENT OFFICE.

HENRY M. CRANE, OF NEW YORK, N. Y;, ASSIGNOR TO IVESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SIGNAL INSTRUMENT FOR TELEPHONE-SUBSTATIONS.

SPECIFICATION forming part of Letters Patent N0. 789,208, dated May 9, 1905.

Application filed January 2, 1904. Serial No. 187,399.

To all whom it may concern.-

Be it known that I, HENRY M. CRA E, a citi zen of the United States, residing at Ne W York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Signal Instruments for Telephone-Substations, of which the following is a full, clear, concise, and exact description.

My invention relates to substation apparatus for telephone-exchanges; and its object is particularly to provide an improved and simplified call-signal device which will be extremely compact, inexpensive, and of neat ap pearance. I

In accordance with my invention an inclosing cover of resonant material is provided for the signal-receiving magnet, said cover having a portion adapted to be struck by the tapper, which is actuated by the magnet, so that the cover itself thus serves as the resonant body which sounds the signal, the two gongs heretofore almost universally employed being entirely dispensed with. For convenience I may mount other apparatus, such as the subscribers induction coil and condenser, within the same inclosing cover. tremely compact and neat-appearing substation set is thus provided.

I will describe my invention by reference to the accompanying drawings, in WlllCh Figure 1 is a view in elevation of a substation set comprising condenser, induction-coil, and signal receiving device, the inclosing cover, which also serves as the resonant body to sound the call-signal, being shown in section. Fig. 2 is a vertical sectional view on line 2 2 of Fig. 1, and Fig. 3 is a detail view showing the two lugs which may be carried by the inclosing cover in position to be struck by the tapper of the signal-magnet.

The same letters of reference are used to designate the same parts in all three figures.

In the apparatus shown the polarized signal-magnet a of the usual type is mounted upon the wooden back plate I), which may also support a condenser cand induction-coil d, as shown. A thin sheet-metal cover 0 fits over the back plate 6 and is secured thereto by screws 7 f, entirely inclosing the apparatus An ex mounted upon said back plate, so that said ap- 5 paratus is concealed and protected. The polarized signal-receiving magnet to has the usual vibrating armature a, which carries a tapper a Two lugs 0 mounted upon and forming part of the inclosing cover, are arranged in position .to be struck by the tapper a of the signal-magnet as it vibrates in response to the alternating signalingcurrent. The cover a serves as a resonator, so that a loud rattle is produced when the tapper is actuated by the magnet, sounding a signal which will be about as clearly audible as that produced when the usual gongs are employed.

The lugs e 6 may be carried by arms 6 e pivoted to the cover in such a manner as to be 5 slightly adjustable thereon, and set-screws 0* may be provided to secure the lugs in their adjusted positions.

The supporting-plate 7) is preferably slightly cut away along its upper and adjacent edges, 7 as shown, so as to allow free vibration of that portion of the cover a surrounding the lugs 0 Having thus described my invention, I claim 1. In a substation instrument for telephoneexchanges, the combination with a supporting-plate, of a call-signal-receiving magnet mounted thereon, a tapper actuated by said magnet, a protecting-cover secured to said supporting-plate and inclosing said magnet, 30 said cover being of resonant material and having an adjustable portion adapted to be struck by the tapper, the plate being cut away along and adjacent to the portion of the cover carrying said adjustable part, and free from con- 5 nection with the cover at said points, to permit free vibration of said adjustable part, whereby a signal is sounded.

2. The combination with the supportingplate 6, of a signal-magnet (4 having a tapper 9 arranged to be vibrated by said magnet, a protecting sheet-metal cover secured to said back plate and inclosing said magnet, arms 6 c pivoted to said cover, lugs carried by said arms in position to be struck by said vibrating tapper, said arms being adapted to be moved to vary the position of said lugs with respect to the tapper, and set-screws ee" adapted to lock I cover having another portion of the edge thereof free from contact with the supporting-plate and adapted to be struck by the said tapper.

In Witness whereof I hereunto subscribe my name this 1st day of July, A. D. 1903.

HENRY M. CRANE.

Witnesses:

ROBERT WHITE, J r., FRANCIS L. GILMAN. 

